Titration Curves Flashcards

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What is a titration curve?

A titration curve is a graph that shows how the pH of a solution changes as you add acid or alkali.

What is on the two axes of a titration curve?

The y-axis shows pH. The x-axis shows the volume of acid or alkali added, usually in cm³.

How do you get the data to draw a titration curve?

You add small volumes of acid or alkali, measure the pH after each addition, and plot pH against volume added.

On a titration curve, what does the steep vertical section show?

It shows a very fast change in pH. This happens when the acid and alkali are close to neutralising each other.

What is the equivalence point on a titration curve?

It is the point in the middle of the steep rise where the acid and alkali are in exactly equal amounts.

For a strong acid with a strong alkali, what is the pH at the equivalence point on the curve?

The pH at the equivalence point is about pH 7, because the solution is neutral.

How does the start of a titration curve show if the acid in the flask is strong or weak?

A strong acid starts at a very low pH. A weak acid starts at a higher pH, though it is still below 7.

For a weak acid with a strong alkali, is the pH at the equivalence point above or below 7?

The pH at the equivalence point is above 7, because the salt formed makes the solution slightly alkaline.

Why must the indicator change colour over the steep part of a titration curve?

Because that is where the pH changes very quickly, so the colour change will match the exact neutralisation point.

On a titration curve, what controls the pH after the equivalence point?

After the equivalence point, the pH is mainly controlled by the extra acid or alkali that has been added in excess.